()万 ＜ 56709 ＜ ()万 ()万 ＜ 983309 ＜ ()万
()万 ＜ 3450009 ＜ ()万 ()万 ＜ 1221000 ＜ ()万
()万 ＜ 7689000 ＜ ()万 ()万 ＜ 100010 ＜ ()万

5万＜56709＜6万
98万＜983309＜99万
345万＜3450009＜346万
122万＜1221000＜123万
768万＜7689000＜769万
10万＜100010＜11万

3900 + 3100 = 290 × 2 = 660 ÷ 2 =
5400 - 3200 = 4900 ÷ 7 = 300 ÷ 6 =
270 ÷ 9 = 450 ÷ 3 = 969 ÷ 3 =
9696 ÷ 3 = 6464 ÷ 2 = 30 × 30 =
40 × 40 = 400 × 5 = 100 ÷ 5 =
6 × 300 = 8 × 700 = 9 × 700 =
9000 ÷ 3 = 2000 ÷ 4 = 770 ÷ 7 =
600 × 7 = 15 × 300 = 540 ÷ 9 =
2700 + 2300 = 9000 - 900 = 50000 + 60000 =
200 + 8000 = 1600 × 3 = 450 × 2 =

解析：
这些题目都是基础的数学运算题目，包括加法、减法、乘法、除法。
答案：
$3900 + 3100 = 7000$
$290 × 2 = 580$
$660 ÷ 2 = 330$
$5400 - 3200 = 2200$
$4900 ÷ 7 = 700$
$300 ÷ 6 = 50$
$270 ÷ 9 = 30$
$450 ÷ 3 = 150$
$969 ÷ 3 = 323$
$9696 ÷ 3 = 3232$
$6464 ÷ 2 = 3232$
$30 × 30 = 900$
$40 × 40 = 1600$
$400 × 5 = 2000$
$100 ÷ 5 = 20$
$6 × 300 = 1800$
$8 × 700 = 5600$
$9 × 700 = 6300$
$9000 ÷ 3 = 3000$
$2000 ÷ 4 = 500$
$770 ÷ 7 = 110$
$600 × 7 = 4200$
$15 × 300 = 4500$
$540 ÷ 9 = 60$
$2700 + 2300 = 5000$
$9000 - 900 = 8100$
$50000 + 60000 = 110000$
$200 + 8000 = 8200$
$1600 × 3 = 4800$
$450 × 2 = 900$

在7和8之间添个0,这个数最接近700万,读作。

5；七百万零八